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Exploring Mcgurk Effect Through Tadoma Method of Speech Perception Salem State University Digital Commons at Salem State University Honors Theses Student Scholarship 2017-05-01 Exploring McGurk Effect Through Tadoma Method Of Speech Perception Ashley Moore Salem State University Follow this and additional works at: https://digitalcommons.salemstate.edu/honors_theses Part of the Psychiatry and Psychology Commons Recommended Citation Moore, Ashley, "Exploring McGurk Effect Through Tadoma Method Of Speech Perception" (2017). Honors Theses. 143. https://digitalcommons.salemstate.edu/honors_theses/143 This Thesis is brought to you for free and open access by the Student Scholarship at Digital Commons at Salem State University. It has been accepted for inclusion in Honors Theses by an authorized administrator of Digital Commons at Salem State University. Running Head: EXAMINING THE MCGURK EFFECT ON TADOMA METHOD OF SPEECH PERCEPTION EXAMINING THE MCGURK EFFECT ON THE TADOMA METHOD OF SPEECH PERCEPTION Honors Thesis Presented in Partial Fulfillment of the Requirements for the Degree of Bachelor of Science in Psychology In the Department of Psychology at Salem State University By Ashley Moore Dr. David Gow Faculty Advisor Department of Psychology Commonwealth Honors Program Salem State University 2017 EXAMING THE MCGURK EFFECT ON TADOMA 2 Table of Contents Abstract…………………………………………………………………………..………3 Introduction………………………………………………………………………..……..4 Methods………………………………………………………………………………….10 Results…………………………………………………………………………...……….12 Discussion………………………………………………………………….…………….15 References…………………………………………………………………..……………18 Appendix…………………………………………………………………………………19 EXAMING THE MCGURK EFFECT ON TADOMA 3 Abstract The process of understanding speech perception is one that also poses a handful of questions. The motor theory of speech perception was proposed to resolve some of these issues that arose. While this accounts for things like coarticulation, the evidence for both sides of the fence is mixed. The discovery of mirror neurons and the findings of fMRI studies support the motor theory, whereas work done with Japanese quails tends to contradict this. The current study explores the speech phenomenon the McGurk effect, what happens when an individual fuses the speech sounds they hear with the one they see being articulated. The problem that comes up is whether the McGurk effect is a result of articulatory cues or training. To examine this claim in a different way than in the past, eighteen subjects were taught the speech perception method of Tadoma. After two days of training, the participants were given mismatched sounds that would potentially result in a McGurk effect. The number of fused responses from subjects increased after the training; however the statistic was not significant. Therefore, it can be concluded that while more of a McGurk effect did in fact appear after the two days of training, it was not valuable enough to prove that speech perception is a product of experience and not just articulatory information. EXAMING THE MCGURK EFFECT ON TADOMA 4 Introduction How is it that people know exactly what someone else is saying? How is that only humans are capable of interpreting speech sounds? Researchers have set out to resolve many problems that have come up, one of which is the lack of invariance. No two speech sounds will ever sound exactly the same. That is to say, there is no one to one mapping between speech sounds and articulation. The brain’s process of coarticulation is a reason for this lack of invariance. Coarticulation refers to how one speech sound is affected by the proceeding speech sounds. Without even consciously realizing it, an individual will generate any given phoneme differently depending on the surrounding phonemes in a word. To get a depiction of this, refer to Figure 1. The image shows formants for both the sound /di/ and /du/. Take notice of the drastic dissimilarity of each syllable if you were to cut off just the /d/ part of the sound. What this exemplifies is how coarticulation results in speech sounds that appear to be the same, but in fact are articulated rather differently. Gestures, however, do not vary. Every time any individual makes a /ba/ sound, their mouth moves in the same way. Anytime someone makes a /da/ sound, the corresponding gesture is exactly the same as it was to produce the previous one, and the next one, and the next one. This paradigm was originally thought to have been solved by the introduction of the motor theory. The motor theory of speech perception, brought to the forefront by Alvin M. Liberman and Ignatius G. Mattingly, suggests that speech perception relies on an individual’s knowledge of speech articulation (Liberman & Mattingly, 1985). It’s proposed that people perceive spoken words by recognizing the articulatory gestures with which they are pronounced. The underlying question however, and the basis of the current research, is whether or not individuals use these cues to EXAMING THE MCGURK EFFECT ON TADOMA 5 trigger their own representations of speech articulation. The contrasting side being that individuals merely have become habituated to them over time with experience. The motor theory proposes that it is a person’s familiarity with the actual articulatory information that cues them to perceive language. Theoretically though, it could simply be the training humans have with the spoken word that cues them. Therefore, it is possible that with enough training, any arbitrary stimulus could replace articulatory signals and trigger a similar response. Evidence in support of motor theory is extensive, including work done with mirror neurons and fMRIs. While conducting work on Macaque monkeys, researchers found something they called “mirror neurons” (Rizzolatti et al., 1988). Mirror neurons are important to discuss, as they are the backbone of understanding how an individual can produce articulatory gestures based on the speech they are able to perceive. The critical discovery was found in area F5 of the monkeys, which shares a lot of similarities to Broca’s area in the brains of humans. Broca’s area remains the part of the brain primarily responsible for language processing in humans. This subsequently suggested that humans have these mirror neurons that function similarly to how they do in monkeys. Rizzolatti and his colleagues’ study involved examining the monkeys’ control of hand movements, such as grasping and holding. Researchers observed that there were a set of neurons that not only fired when the monkey was actively doing a task (i.e. grasping), but additionally fired when they witnessed the human doing the same thing. If in fact there are such things as mirror neurons in Broca’s area of human brains, it can be assumed that they would function correspondingly. Namely, a set of neurons that fire when a person produces any given speech sounds, would hypothetically also fire when they heard those speech EXAMING THE MCGURK EFFECT ON TADOMA 6 sounds. Mirror neurons could then evidently be the connection between the speech an individual perceives and the gestures through which they produce it. It is presumably the mirror neurons that make it so an individual hears a phoneme and subsequently knows exactly how to make it themselves. Similar to the finding of mirror neurons, studies using fMRIs found data that demonstrated the overlap of the brain regions involved in speech production and speech perception. In a 2006 study, researchers looked at fMRI activity when subjects spoke and listened to certain sounds (Pulvermuller et al., 2006). They gave the participants phonemes such as /p/ and /t/, in which they would need to move their lips and tongues to produce. Results of the fMRIs showed that when an individual was perceiving speech, the largest amount of activity was in the superior temporal complex. Interestingly though, there was a noticeable activation of the same brain regions when a subject was listening to the speech sounds as there was when they articulated them. While there is far-reaching support for the motor theory of speech perception, like most of the scientific world, it is not universally supported by evidence. There are other accepted explanations for the interpretation of speech though. Take for instance the Japanese quail. Research has been done on these kinds of birds and was found that they can actually understand speech similar to humans (Liberman & Mattingly, 1985). So here is an animal that has no ability to produce the speech sounds, but can still perceive it just like a human would be able to. In later years, a study was conducted using four Japanese quails that were trained to identify sounds such as /da/ and /ga/ (Lotto, Kluender & Holt, 1997). What they found was that these quails were demonstrating similar data patterns as EXAMING THE MCGURK EFFECT ON TADOMA 7 humans did, indicating that speech perception may not be limited to species that have the ability to articulate the sounds themselves, namely humans. The McGurk effect is a psycholinguistic phenomenon that demonstrates how non- acoustic information can affect speech perception. The perceptual effect was first discussed by Harry McGurk (McGurk & MacDonald, 1976). The first step in the demonstration is having an audio sound of someone saying “ba” for example. Separately, the participants have a visual of a one person mouthing “ba” and another mouthing “ga.” Even though, the actual sound has not changed, the participants recall hearing a blended sound of the two, i.e. “da.” These kinds of experiments are of great importance to the world of psychology and of language in general. What it does is showcase the fact that speech perception is a multisensory task. We don’t just use auditory information when interpreting speech, but rather we use auditory information integrated with visual information. This was an extremely significant finding because before that it was assumed that speech perception was very much a product strictly of auditory input. In addition to the obvious takeaway that the McGurk effect demonstrates the merging of information from two vital senses in the process of speech perception, it also has other noteworthy implications.
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